[Asterisk-Users] IAX2 bandwidth efficiency calculations from Farfon

[Benjamin on Asterisk Mailing Lists]

On Sat, 30 Oct 2004 21:15:51 -0400, Steve Kann <stevek at stevek.com> wrote:
> The chart is good, but I think it makes a mistake for iLBC:
> 
> Isn't iLBC 13.something kbps?
> 
> Also, since iLBC uses 30ms frames (when used with asterisk, at least),
> it has slightly lower overhead.  Approx 2/3 as much overhead.

I had assumed that this was the reason why Wasim used 9kbps for ILBC.

13.5 * 2/3 = 9

But, you are right, there should be a footnote somewhere that says so.

> (not that I'm a big iLBC fanboy or anything.. -- I still prefer a free
> codec).

Indeed.

Also, ILBC is more forgiving on packet loss. G729 sucks with packet loss.

In my experience the combination of IAX and ILBC is what makes
reliable VoIP possible in third world countries with poor internet
infrastructure. Places where SIP+G729 simply does not work.

rgds
benjk
-- 
Sunrise Telephone Systems, 9F Shibuya Daikyo Bldg., 1-13-5 Shibuya,
Tokyo, Japan.

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